On Sun, Feb 23, 2014 at 12:02 PM, Emmanuel Grumbach <egrumbach@xxxxxxxxx> wrote: > > > > On 02/23/2014 09:02 AM, Grumbach, Emmanuel wrote: > >> > >> On Sat, Feb 22, 2014 at 10:18 PM, Grumbach, Emmanuel > >> <emmanuel.grumbach@xxxxxxxxx> wrote: > >>>> > >>>> (Resending as plain text) > >>>> > >>>> I have a strange issue with my Intel Wireless 7260 adapter on my Dell XPS > >> 13 > >>>> (Haswell). It seems that packets are received but aren't processed by the > >>>> kernel or something until more packets are transmitted. The net effect is > >>>> that the laptop's wireless seems somewhat choppy. I can demonstrate > >> this > >>>> by running something in a remote ssh session that generates periodic > >>>> output, and that output doesn't appear until I generate more outgoing > >>>> traffic. It's hard to describe it beyond that, but I took a screen capture > >> which > >>>> demonstrates this very well: > >>>> http://www.youtube.com/watch?v=4RMURSMszmc > >>>> > >>>> lspci shows the wireless card as: 02:00.0 Network controller: Intel > >> Corporation > >>>> Wireless 7260 (rev 6b) uname -a: Linux dalek 3.11.0-12-generic #19- > >> Ubuntu > >>>> SMP Wed Oct 9 16:20:46UTC 2013 x86_64 x86_64 x86_64 GNU/Linux > >>>> > >>>> I googled this without success. I can gather diagnostic information if you > >> send > >>>> me instructions, I'm just not sure where to start or what to look for. Is this > >> a > >>>> bug in the driver? Maybe in the card microcode itself? Has anyone else > >>>> reported this issue? It seems very strange. > >>>> Any help is appreciated. > >>> > >>> Can you please send the output of dmesg? > >>> Tracing output can help too - but let's start with dmesg output. > >>> > >> > >> My full dmesg output is here: http://smkent.net/stuff/dmesg-dalek- > >> 20140222 > >> > > > > Your dmesg looks healthy > > > >> Here's some selected output. I'm not sure if it's useful. > >> > >> smkent@dalek Desktop $ grep -ie iwl -e 80211 dmesg-dalek-20140222 > >> [ 3.968070] cfg80211: Calling CRDA to update world regulatory domain > >> [ 3.976500] iwlwifi 0000:02:00.0: can't disable ASPM; OS doesn't > >> have ASPM control > >> [ 3.976585] iwlwifi 0000:02:00.0: irq 59 for MSI/MSI-X > >> [ 4.115345] iwlwifi 0000:02:00.0: loaded firmware version 22.1.7.0 > >> op_mode iwlmvm > >> [ 4.157435] iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band > >> Wireless AC 7260, REV=0x144 > >> [ 4.157523] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S > >> [ 4.157691] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S > >> [ 4.269377] cfg80211: World regulatory domain updated: > >> [ 4.269383] cfg80211: (start_freq - end_freq @ bandwidth), > >> (max_antenna_gain, max_eirp) > >> [ 4.269387] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), > >> (300 mBi, 2000 mBm) > >> [ 4.269390] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), > >> (300 mBi, 2000 mBm) > >> [ 4.269393] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), > >> (300 mBi, 2000 mBm) > >> [ 4.269396] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), > >> (300 mBi, 2000 mBm) > >> [ 4.269399] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), > >> (300 mBi, 2000 mBm) > >> [ 4.379283] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs' > >> [ 4.709497] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S > >> [ 4.709671] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S > >> [ 9676.817175] cfg80211: Calling CRDA to update world regulatory domain > >> [ 9676.823809] cfg80211: World regulatory domain updated: > >> [ 9676.823820] cfg80211: (start_freq - end_freq @ bandwidth), > >> (max_antenna_gain, max_eirp) > >> [ 9676.823827] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), > >> (300 mBi, 2000 mBm) > >> [ 9676.823834] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), > >> (300 mBi, 2000 mBm) > >> [ 9676.823840] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), > >> (300 mBi, 2000 mBm) > >> [ 9676.823846] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), > >> (300 mBi, 2000 mBm) > >> [ 9676.823851] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), > >> (300 mBi, 2000 mBm) > >> [ 9680.014722] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S > >> [ 9680.014890] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S > >> > >> I haven't taken a kernel trace before but I'm happy to do so if you > >> can point me toward some instructions. > >> > > > > as root: > > trace-cmd record -e iwlwifi -e iwlwifi_msg. > > > > Reproduce the bug while it's running. Stop with Ctrl+C when the bug reproduced. > > This will produce a trace.dat file which you can compress and send over email. > > > > Could you please try to reproduce with power save disabled? > > options iwlmvm power_scheme=1 > > Thanks. Huh, interesting. When I set that option the problem seems to go away. I flipped back and forth between power_scheme=1 and power_scheme=2 in iwlmvm (modinfo says 2 is the default), and the problem didn't reproduce when power_scheme=1. I assume my battery life will suffer if I permanently set power_scheme=1? :-) Should I take a new trace or gather any other information? I won't be my computer all day but I'll be able to respond / collect any needed info intermittently. Thanks, Stephen -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
